Mathmatics

Classes
class	gr_conjugate_cc
	output = complex conjugate of input More...
class	gr_fxpt
	fixed point sine and cosine and friends. fixed pt radians --------- -------- -2**31 -pi 0 0 2**31-1 pi - epsilon More...
class	gr_nlog10_ff
	output = n*log10(input) + k More...
class	gr_random
	pseudo random number generator More...
class	gr_rms_cf
	RMS average power. More...
class	gr_rms_ff
	RMS average power. More...
class	gri_glfsr
	Galois Linear Feedback Shift Register using specified polynomial mask Generates a maximal length pseudo-random sequence of length 2^degree-1. More...
class	gri_lfsr_15_1_0
	Linear Feedback Shift Register using primitive polynomial x^15 + x + 1 Generates a maximal length pseudo-random sequence of length 2^15 - 1 bits. More...
class	gri_lfsr_32k
	generate pseudo-random sequence of length 32768 bits. This is based on gri_lfsr_15_1_0 with an extra 0 added at the end of the sequence. More...
class	gr_add_cc
	output = sum (input_0, input_1, ...) Add across all input streams. More...
class	gr_add_const_cc
	output = input + constant More...
class	gr_add_const_ff
	output = input + constant More...
class	gr_add_const_ii
	output = input + constant More...
class	gr_add_const_sf
	output = input + constant More...
class	gr_add_const_ss
	output = input + constant More...
class	gr_add_const_vcc
	output vector = input vector + constant vector More...
class	gr_add_const_vff
	output vector = input vector + constant vector More...
class	gr_add_const_vii
	output vector = input vector + constant vector More...
class	gr_add_const_vss
	output vector = input vector + constant vector More...
class	gr_add_ff
	output = sum (input_0, input_1, ...) Add across all input streams. More...
class	gr_add_ii
	output = sum (input_0, input_1, ...) Add across all input streams. More...
class	gr_add_ss
	output = sum (input_0, input_1, ...) Add across all input streams. More...
class	gr_add_vcc
	output = sum (input_0, input_1, ...) Add across all input vectors. More...
class	gr_add_vff
	output = sum (input_0, input_1, ...) Add across all input vectors. More...
class	gr_add_vii
	output = sum (input_0, input_1, ...) Add across all input vectors. More...
class	gr_add_vss
	output = sum (input_0, input_1, ...) Add across all input vectors. More...
class	gr_and_bb
	output = input_0 & input_1 & , ... & input_N) bitwise boolean and across all input streams. More...
class	gr_and_ii
	output = input_0 & input_1 & , ... & input_N) bitwise boolean and across all input streams. More...
class	gr_and_ss
	output = input_0 & input_1 & , ... & input_N) bitwise boolean and across all input streams. More...
class	gr_divide_cc
	output = input_0 / input_1 / input_x ...) Divide across all input streams. More...
class	gr_divide_ff
	output = input_0 / input_1 / input_x ...) Divide across all input streams. More...
class	gr_divide_ii
	output = input_0 / input_1 / input_x ...) Divide across all input streams. More...
class	gr_divide_ss
	output = input_0 / input_1 / input_x ...) Divide across all input streams. More...
class	gr_integrate_cc
	output = sum(input[0]...input[n]) Integrate successive samples in input stream and decimate More...
class	gr_integrate_ff
	output = sum(input[0]...input[n]) Integrate successive samples in input stream and decimate More...
class	gr_integrate_ii
	output = sum(input[0]...input[n]) Integrate successive samples in input stream and decimate More...
class	gr_integrate_ss
	output = sum(input[0]...input[n]) Integrate successive samples in input stream and decimate More...
class	gr_multiply_cc
	output = prod (input_0, input_1, ...) Multiply across all input streams. More...
class	gr_multiply_const_cc
	output = input * constant More...
class	gr_multiply_const_ff
	output = input * constant More...
class	gr_multiply_const_ii
	output = input * constant More...
class	gr_multiply_const_ss
	output = input * constant More...
class	gr_multiply_const_vcc
	output vector = input vector * constant vector (element-wise) More...
class	gr_multiply_const_vff
	output vector = input vector * constant vector (element-wise) More...
class	gr_multiply_const_vii
	output vector = input vector * constant vector (element-wise) More...
class	gr_multiply_const_vss
	output vector = input vector * constant vector (element-wise) More...
class	gr_multiply_ff
	output = prod (input_0, input_1, ...) Multiply across all input streams. More...
class	gr_multiply_ii
	output = prod (input_0, input_1, ...) Multiply across all input streams. More...
class	gr_multiply_ss
	output = prod (input_0, input_1, ...) Multiply across all input streams. More...
class	gr_multiply_vcc
	output = prod (input_0, input_1, ...) Element-wise multiply across all input vectors. More...
class	gr_multiply_vff
	output = prod (input_0, input_1, ...) Element-wise multiply across all input vectors. More...
class	gr_multiply_vii
	output = prod (input_0, input_1, ...) Element-wise multiply across all input vectors. More...
class	gr_multiply_vss
	output = prod (input_0, input_1, ...) Element-wise multiply across all input vectors. More...
class	gr_not_bb
	output = ~input_0 bitwise boolean not across input stream. More...
class	gr_not_ii
	output = ~input_0 bitwise boolean not across input stream. More...
class	gr_not_ss
	output = ~input_0 bitwise boolean not across input stream. More...
class	gr_or_bb
	output = input_0 | input_1 | , ... | input_N) bitwise boolean or across all input streams. More...
class	gr_or_ii
	output = input_0 | input_1 | , ... | input_N) bitwise boolean or across all input streams. More...
class	gr_or_ss
	output = input_0 | input_1 | , ... | input_N) bitwise boolean or across all input streams. More...
class	gr_sub_cc
	output = input_0 - input_1 - ...) Subtract across all input streams. More...
class	gr_sub_ff
	output = input_0 - input_1 - ...) Subtract across all input streams. More...
class	gr_sub_ii
	output = input_0 - input_1 - ...) Subtract across all input streams. More...
class	gr_sub_ss
	output = input_0 - input_1 - ...) Subtract across all input streams. More...
class	gr_xor_bb
	output = input_0 ^ input_1 ^ , ... ^ input_N) bitwise boolean xor across all input streams. More...
class	gr_xor_ii
	output = input_0 ^ input_1 ^ , ... ^ input_N) bitwise boolean xor across all input streams. More...
class	gr_xor_ss
	output = input_0 ^ input_1 ^ , ... ^ input_N) bitwise boolean xor across all input streams. More...
Functions
float	gr_fast_atan2f (float y, float x)
	Fast arc tangent using table lookup and linear interpolation.

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Detailed Description

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Function Documentation

float gr_fast_atan2f	(	float	y,
		float	x
	)

Fast arc tangent using table lookup and linear interpolation.

Parameters:

	y	component of input vector
	x	component of input vector

Returns:

float angle angle of vector (x, y) in radians

This function calculates the angle of the vector (x,y) based on a table lookup and linear interpolation. The table uses a 256 point table covering -45 to +45 degrees and uses symetry to determine the final angle value in the range of -180 to 180 degrees. Note that this function uses the small angle approximation for values close to zero. This routine calculates the arc tangent with an average error of +/- 0.045 degrees.